2005 INFINITI QX4 Factory Service Manual

Page 1609 of 3419

INFINITI QX4 2005  Factory Service Manual EC-418Revision: October 2005
DTC P1146, P1166 HO2S2
2005 QX56
Wiring DiagramUBS00H87
BANK 1
BBWA1678E

Page 1610 of 3419

INFINITI QX4 2005  Factory Service Manual DTC P1146, P1166 HO2S2
EC-419
C
D
E
F
G
H
I
J
K
L
MA
EC
Revision: October 20052005 QX56
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use E

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INFINITI QX4 2005  Factory Service Manual EC-420Revision: October 2005
DTC P1146, P1166 HO2S2
2005 QX56
BANK 2
BBWA1679E

Page 1612 of 3419

INFINITI QX4 2005  Factory Service Manual DTC P1146, P1166 HO2S2
EC-421
C
D
E
F
G
H
I
J
K
L
MA
EC
Revision: October 20052005 QX56
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use E

Page 1613 of 3419

INFINITI QX4 2005  Factory Service Manual EC-422Revision: October 2005
DTC P1146, P1166 HO2S2
2005 QX56
2. CLEAR THE SELF-LEARNING DATA
 With CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Select “SELF-LEARNIN

Page 1614 of 3419

INFINITI QX4 2005  Factory Service Manual DTC P1146, P1166 HO2S2
EC-423
C
D
E
F
G
H
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MA
EC
Revision: October 20052005 QX56
3. CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect heated oxygen sensor

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INFINITI QX4 2005  Factory Service Manual EC-424Revision: October 2005
DTC P1146, P1166 HO2S2
2005 QX56
5. CHECK HEATED OXYGEN SENSOR 2
Refer to EC-424, "
Component Inspection" .
OK or NG
OK >> GO TO 6.
NG >> Replace malfunctioning heated oxy

Page 1616 of 3419

INFINITI QX4 2005  Factory Service Manual DTC P1146, P1166 HO2S2
EC-425
C
D
E
F
G
H
I
J
K
L
MA
EC
Revision: October 20052005 QX56
Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner tool J-438